Many of us own desktop computers, laptops, monitors, televisions, audio equipment, etc. that we wish to store. Storing electronics must be done properly if you want to preserve them. Prevent contact with too much water or moisture. Wrap your valuable electronics in plastic to ensure that water, like from a roof leak, cannot penetrate and ruin them. Carefully wrap your electronics in some type of waterproof covering the has no holes or cracks in it. Store items up off the floor, so no water that might enter from outside can touch them. Placing them in a cardboard box on a floor will not work, because water could soak through the cardboard.
Putting items on shelves at least two feet off the ground would most likely work better.
Another danger is very humid conditions, because they can result in condensation forming on electronics, which is exactly what you don’t want to happen. A consistent amount of condensation can lead to the growth of mold, or which is obviously unwanted and damaging, as well as the condensation itself. If available, you may want to consider storing your electronics in a climate-controlled unit that may minimize the instance of humidity.
Dust can also be an issue with electronics. If you carefully cover your electronics you prevent dust from intruding. You may want to also periodically visit your unit to remove dust with a vacuum cleaner.
Rodents like rats and mice can chew through electrical wire casings and cables, so they may need to be placed in containers thick enough that they can’t get inside. Also, if you do not store food in the unit, rats and mice will be less likely to be present in the first place.
Hopefully, you have learned to store your electronics in a safe manner that prevents some of the common hazards that might deteriorate them.